I'll just mention that I'm retired also (hence the time already given), disabled, awaiting an operation, and more physically limited than usual. But I have a life, and interests; I'm a deep Bible student, and viewing my time as an asset. I'm also a hardware geek. You haven't shown me this was ever reliable, ergo we lack any sound reason to think it's fixable.

I went into this 'Cobble your own DSDT' thing in 2008/9 when I had major issues with a much better documented HP Compaq 6715S. The thing is, the DSDT is a binary. It's a settings EEPROM read into ram. You have to have manufacturer details about what the various options mean - in effect, the API. You don't. Game over. You lose.
The DSDT is one of those things only released when by a manufacturer when they are going down in flames. Via, for example, released the DSDT related to their MPV3 Chipset (Google 'Via mpv3 hardware fault'). They had cooked the dsdt to allow them to live with a creative soundblaster sound card, and given themselves bulk disk copying issues. I had one of these, back in 1998-2001(?) and managed to cook their chipset back according to their instructions. It didn't save the usb ports, 2 of which were useless. I was informed They were bought for next to nothing close to liquidation, poor products were abandoned, and the C3 may have been the only survivor.